ag9111 wrote:The problem is not the common chassis ground system that vehicles use but the fact that you are adding a second voltage source to that system.
If the two batteries were at exactly the same potential then you wouldn't have a problem.
Its the fact that you have two batteries at different potentials that causes the problem. Circulating currents are developed that continuously corrode the lesser terminals and you end up with black cable rot on the negative leads.
The more you isolate the 2 systems the better off you are hence all my secondary battery negatives go to there own bus bar that is not attached, mechanically or electrically,to the vehicle chassis. I have a negative cable that then runs to the secondary battery. The negative battery cable is then run to the front of the car and attached to the negative battery lead. This is the easiest & closest spot I can get to the battery so that we have equalisation of the negatives. This is more to do with maximum charging of the secondary battery. With only one point of contact of the two negatives then no currents can flow through the chassis that cause corrosion.
coughy wrote:cheers gibbo how does the cable connect to the connector??
is it just bear cable being squished in the screw down bolt???
or can u use eyelets on the end of the cable to attach???
rokster wrote:Hi all..
Apologies for dragging an <oldish> thread up... but. I've got a question or 2..
Assuming I go with the suggested set-up above - battery in the tub, circuit breakers everywhere, ctek charger etc etc. .does this then mean that any additional lights, accessories inside the cabin, and most importantly, the winch are being run from the main cranking battery ? Or do you run thick cables back to the front for the winch ?
Enlighten me please !
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